A telephone is a device that lets you talk to people who are a long, long way away from you - almost anywhere else in the entire world. Telephones are the most common appliance in the world.
More recently, telephones that don't need to be connected to the phone network by wires have been invented. These are called mobile phones.
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The trombone is a musical instrument in the brass family. It is made from a long tube of brass looped around, and like all brass instruments is played by buzzing your lips into the mouthpiece. Trombones have a slide that you work with one arm. Pulling it out makes the length of brass tubing longer, and changes the note that the trombone plays.
A xylophone is a kind of musical instrument. You make music by hitting the different-sized keys with small hammers to play a tune.
The keys on xylophones are typically made out of wood, although some modern versions are made from plastic or fibreglass. Very early xylophones had keys made from gourds. Xylophones are very similar to glockenspiels and vibraphones. Glockenspiels are made from metal and have a higher pitch, while a vibraphone is also made of metal but is a more modern instrument and has a sustain pedal. The instrument in the picture is actually a vibraphone.
Most people call all of these similar instruments xylophones. The most popular image of a "xylophone" is the children's six or eight key version with brightly colored metal keys commonly seen in toy stores.
